Indian Constitution and International Law (Articles 51, 253)

The Indian Constitution does not import international law into the municipal field by a single sweeping clause. It distributes the work across three nodes — Article 51 sets the directive, Article 73 vests the executive power, and Article 253 read with Entry 14 of the Union List places the legislative implementation power in Parliament. Together they make India a dualist polity in operation: a treaty becomes law for individuals only when Parliament says so, but the State remains constitutionally pledged to honour the international order it has signed up to.

For the judiciary aspirant, the architecture matters because every reported case where a court has asked "does this treaty bind us?" — from the Berubari references to Maganbhai, from Jolly George Verghese to Vishaka — turns on which of these three constitutional nodes is engaged. Mistake the architecture and the case law will look chaotic; understand the architecture and the case law falls into a clean three-tier scheme.

The constitutional starting point — dualism by design

India belongs to the dualist tradition. The two-system framing — international law as one body of norms regulating inter-State relations, municipal law as another body governing the conduct of individuals within the State — was the working assumption of the Constituent Assembly when it drafted the relationship clauses. The Supreme Court has affirmed this position repeatedly; in State of West Bengal v. Kesoram Industries Ltd. (2004) 10 SCC 201, the Court stated in plain terms that the principles and rules of international law cannot be invoked in municipal courts unless expressly incorporated into national law by domestic legislation.

The dualist position has three operational consequences. First, a treaty signed and ratified by the Union does not, by that act alone, alter the rights or duties of citizens. Second, customary international law is admitted into the domestic field only on the qualified footing of harmony with existing statutes — never automatically over them. Third, the conflict-resolution rule is fixed: if Parliament has spoken clearly to the contrary, the municipal statute prevails and the State carries the international wrong on its conscience until it amends the law.

This is the backdrop against which Articles 51, 73, 253 and Entry 14 must be read. The deeper conceptual debate between dualism and the unitary view of law is canvassed in our chapter on the nature and basis of international law; the present chapter takes that debate as settled in favour of dualism for India and walks through the constitutional plumbing that follows.

Article 51 — the directive principle

Article 51 sits in Part IV of the Constitution under the heading "Promotion of international peace and security". It provides that the State shall endeavour to —

The clause is a directive principle. It is non-justiciable under Article 37, which means that no court can compel the State to perform any specific obligation contained in it. But Article 37 also calls the directive principles "fundamental in the governance of the country" and casts a duty on the State to apply them in making laws. Article 51 is therefore a constitutional pledge of good international citizenship, addressed to all three branches of the Union.

The drafting of Article 51(c) is precise. It separates "international law" from "treaty obligations" — a distinction the Supreme Court has used to argue that the framers had customary international law primarily in mind when they wrote "international law", because treaty obligations were given their own phrase. That reading aligns with the dualist position: treaties need parliamentary intervention before they bite, but customary norms have a softer interpretive footing under Article 51(c) when they do not collide with a statute.

Article 51 also does interpretive work. Beginning with Kesavananda Bharati v. State of Kerala (AIR 1973 SC 1461), the Supreme Court has held that the language of the Constitution should, if not intractable, be read in the light of the United Nations Charter and the international declarations India has subscribed to. The principle was put more sharply in Vishaka v. State of Rajasthan (1997) 6 SCC 241, where the Court drew on the Convention on the Elimination of All Forms of Discrimination Against Women to fill a domestic vacuum and frame guidelines under Article 32. Article 51 supplied the constitutional warrant for that interpretive move; the technique itself is examined in the companion chapter on implementation of international treaties in Indian courts.

Article 73 — executive power over treaty-making

Article 73 of the Constitution states that the executive power of the Union extends to all matters in respect of which Parliament has power to make law. Because Parliament has exclusive law-making power over treaties under Entry 14 of the Union List, the treaty-making power is in the executive — specifically, in the President acting on the advice of the Council of Ministers under Article 74.

The settled position is that the conclusion of treaties is an executive act, not a legislative one. Parliament need not pre-authorise every treaty India enters. As early as Union of India v. Manmull Jain (AIR 1954 Cal 615), the Calcutta High Court held that the President makes a treaty in the exercise of executive power and no Indian court can question its validity on that ground. The Supreme Court took the same view in Ramjawaya Kapur v. State of Punjab (AIR 1955 SC 549) and again in Jayantilal Amritlal Shodhan v. F.N. Rana (AIR 1964 SC 648), holding that while Entry 14 of the Union List makes treaty-making a subject for Union legislation, the Union Government can enter into treaties even though no enabling legislation has been passed under that Entry.

Three points flow from Article 73. First, accession to a multilateral convention — the International Covenant on Civil and Political Rights, the Convention against Torture, the Vienna Convention on Diplomatic Relations — is something the Union can do on its own constitutional steam. The international obligation arises immediately on ratification. Second, the executive can also implement a treaty within the domestic field to the extent the implementation does not require altering existing laws or creating new rights and duties for individuals. The leading illustration is the Vishaka court's reliance on Article 73 to direct interim guidelines binding on workplaces until Parliament legislated. Third, treaties that affect the rights of citizens, alter existing law, or commit the country to financial outlay beyond budgetary allocations require parliamentary intervention before they can be domestically enforced — the dualist line that Article 73 itself does not erase.

The executive's treaty-making power is not unreviewable in every respect. The Supreme Court has accepted, particularly in cases involving territorial concessions, that some categories of agreement require constitutional or parliamentary endorsement. The Berubari Union reference (AIR 1960 SC 845) held that an agreement involving cession of Indian territory to Pakistan required a constitutional amendment under Article 368 because it altered the First Schedule. Berubari Union (No. 2) (AIR 1966 SC 644) drew the line in the opposite direction: returning territory that de jure belonged to Pakistan was not cession and could be effected by executive action alone. Maganbhai Ishwarbhai Patel v. Union of India (AIR 1969 SC 783) refined the rule by holding that a settlement of a boundary dispute is not cession of territory at all; an arbitral award fixing the Rann of Kutch boundary could be implemented by exchange of letters under the executive power. Union of India v. Sukumar Sengupta (AIR 1990 SC 1692) followed the same logic for the lease in perpetuity of Teen Bigha to Bangladesh — no cession, hence no need for constitutional amendment or fresh legislation.

Article 253 read with Entry 14 of the Union List — the legislative power

Article 253 is the operative implementation clause. It reads —

The "notwithstanding" clause is the working part. It overrides the ordinary federal distribution of legislative powers in Articles 245 and 246. Parliament can legislate on a State List subject — say, public health, agriculture, or local self-government — if the legislation is framed to give effect to a treaty India has signed. The power was inserted because the framers anticipated that treaty subjects would not respect the neat federal lines of the Seventh Schedule. The Supreme Court endorsed the wide reading in Maganbhai Ishwarbhai Patel: the effect of Article 253 is that, where a treaty deals with a subject within State legislative competence, Parliament alone has the power to make laws to implement it, notwithstanding Article 246(3).

Article 253 must be read with Entry 14 of List I, which deals with "entering into treaties and agreements with foreign countries and implementing of treaties, agreements and conventions with foreign countries". Entry 14 vests the subject in the Union; Article 253 provides the legislative power to override the State List when implementation requires it. The two clauses together make every multilateral convention India ratifies a potentially Union-implementable instrument, regardless of how the underlying subject is allocated in the Seventh Schedule.

Statutes traceable to Article 253

A long catalogue of central statutes recites Article 253 as the source of legislative power. The Geneva Conventions Act, 1960 implements the four Geneva Conventions of 1949. The Diplomatic Relations (Vienna Convention) Act, 1972 enacts the Vienna Convention on Diplomatic Relations into Indian municipal law. The Anti-Hijacking Act, 1982 (and its 2016 successor) gives effect to the Hague and Montreal Conventions on aviation security. The Suppression of Unlawful Acts against Safety of Maritime Navigation Act, 2002 implements the SUA Convention. The Protection of Human Rights Act, 1993 and the Environment (Protection) Act, 1986 also recite Article 253 in their preambles, anchoring themselves in India's commitments under the ICCPR and the Stockholm Declaration respectively. Each is an instance of the same pattern — international undertaking on the cover, parliamentary statute on the operative pages.

The architecture explains why Indian courts treat treaty-implementation statutes with a slightly different interpretive lens. The Apex Court in Gramophone Co. of India Ltd. v. Birendra Bahadur Pandey (AIR 1984 SC 667) applied the Indian Copyright Act, 1957 — itself substantially traceable to the Berne Convention and the Universal Copyright Convention — by reading its provisions in harmony with international copyright norms. Where a domestic statute is the carrying vehicle for an international obligation, courts have a constitutional reason rooted in Articles 51 and 253 to read it consistently with the underlying convention. The doctrinal techniques are unpacked in our chapter on the formation and termination of treaties and again in the companion piece on sources of international law.

Self-executing and non-self-executing treaties — the Maganbhai distinction

Indian constitutional doctrine borrows a vocabulary from American practice when it asks whether a particular treaty needs parliamentary action before it can produce domestic legal effects. The distinction is between treaties that are self-executing and those that are non-self-executing.

The classical statement is in Maganbhai Ishwarbhai Patel, where the Court observed that when a treaty comes into existence it has to be implemented, and this can be done by any of the three branches of government that possesses the constitutional power to do so. Where a treaty acquires full effect automatically in the municipal law, it is "self-executing" — legislation may be passed in aid of implementation but is usually not necessary. Where the treaty affects the rights of citizens or requires alteration of existing law, the Court held, it is "non-self-executing" and parliamentary legislation is constitutionally required before it can be enforced against individuals.

The line is not bright. Three categories illustrate where Indian courts have drawn it:

1. Boundary settlements not amounting to cession. Implementable by executive action under Article 73 — Maganbhai, Sukumar Sengupta.
2. Treaties altering existing penal or procedural law. Require parliamentary enactment — extradition treaties, for instance, were held in Birma v. State (AIR 1951 Raj. 127) and Nanak v. Government of Rajasthan (AIR 1951 Raj. 153) to need legislative incorporation because they entail infringement of the constitutional guarantee of personal liberty under Article 21. India responded with the Indian Extradition Act, 1962, the architecture of which is examined in the chapter on extradition under the 1962 Act.
3. Treaties creating private rights or obligations. The covenant on civil and political rights had been signed by India but, as Krishna Iyer J. explained in Jolly George Verghese v. Bank of Cochin (AIR 1980 SC 470), the positive commitment of the State Parties "ignites legislative action at home but does not automatically make the Covenant an enforceable part of the corpus juris of India". The Civil Procedure Code, 1908 continued to control civil imprisonment for debt until amended by Parliament; the international undertaking did not, on its own, override Section 51 CPC.

The Maganbhai distinction is therefore the constitutional litmus test. Where the treaty affects only inter-State conduct or operates within the existing fabric of Indian law, the executive can implement it under Article 73. Where the treaty would alter the rights or duties of individuals or override existing legislation, Article 253 kicks in and parliamentary action becomes constitutionally indispensable.

Customary international law — the qualified incorporation route

If the treaty branch of the architecture is dualist by design, the customary-law branch is closer to a qualified incorporation. The leading authority is again Gramophone Co. of India Ltd. v. B.B. Pandey. Justice Chinnappa Reddy framed the position with care. Nations, he observed, must march with the international community and municipal law must respect the rules of international law; the comity of nations requires that rules of international law may be accommodated in the municipal law even without express legislative sanction. But where a clear conflict arises, the sovereignty of the constituted legislatures cannot be subjected to external rules. If, in respect of any principle of international law, Parliament says "no", the national court cannot say "yes". National courts are organs of the State, not organs of international law, and must apply national law if international law conflicts with it. Subject to this clear conflict rule, however, courts are under an obligation, within legitimate limits, so to interpret the municipal statute as to avoid confrontation with the comity of nations or the well-established principles of international law.

The same approach was endorsed in Vellore Citizens' Welfare Forum v. Union of India (1996) 5 SCC 647. The Supreme Court recognised the precautionary principle and the polluter-pays principle as customary international environmental law and accepted them as part of the domestic legal regime in the absence of any contrary statute. The conceptual pathway — a custom shown by sufficient State practice and opinio juris — is examined in detail in the chapter on customary international law and general principles; the constitutional pathway by which a custom enters Indian law passes through Article 51(c) and the Gramophone harmony rule.

The customary route has limits. It cannot be used to displace a clear statute. It does not run against the Constitution. And it does not apply to every international rule that has been collected in a treaty — for treaty-based rules, the Article 253 route remains the only constitutionally clean path. Within those limits, the higher courts have used customary international human rights law as a powerful interpretive aid, particularly in fundamental-rights litigation. The technique is at the heart of the Vishaka-line of cases and is the principal subject of the next chapter in this set.

Federal dimension — Article 253 versus the State List

The federal dimension of the treaty-implementation architecture deserves a separate note. India is a Union of States in which legislative power is divided across three lists in the Seventh Schedule. Article 253 cuts across that division. By its express terms, Parliament can legislate on any subject — including subjects in List II (the State List) — for the purpose of implementing a treaty.

The leading exposition is again in Maganbhai: the effect of Article 253 is that where a treaty deals with a subject within the legislative competence of a State, Parliament alone has the power, notwithstanding Article 246(3), to make laws to implement the treaty. The P.B. Samant v. Union of India challenge to the GATT-WTO accession on federalism grounds was unsuccessful for substantially the same reason — the international obligation, once undertaken by the Union under its treaty-making competence, can be implemented by the Union legislature even on State subjects. The federal balance gives way to the international undertaking.

The position is contested as a matter of policy. State governments have, from time to time, sought greater consultation in treaty negotiations that touch State subjects — environment, agriculture, water, trade. The Constitution does not require it. What it requires is only that the implementing legislation be enacted by the body the Constitution recognises as the implementer of treaties — Parliament. The chapter on the subjects of international law explains why this is the universal rule for federal States that are international-law subjects, and the law-of-the-sea chapter on UNCLOS provisions relevant to India shows the same architecture at work — the Maritime Zones Act, 1976 is a Union enactment under Article 253 even though several aspects of fisheries and coastal regulation engage State concerns.

Article 51 in the recent jurisprudence — from Kesavananda to Puttaswamy

The interpretive use of Article 51 has expanded considerably since the 1970s. Kesavananda Bharati opened the door by treating the Constitution as a municipal law that should, if its language is not intractable, be read in the light of the UN Charter and the solemn declarations India has subscribed to. Unni Krishnan v. State of Andhra Pradesh (AIR 1993 SC 217) reinforced the principle that domestic laws of India, including the Constitution, are not to be read as derogatory to international law and that an effort must be made to read them in harmony with the international position in case of any ambiguity.

The same constitutional value drove NALSA v. Union of India (AIR 2014 SC 1863), where the Court drew on the Yogyakarta Principles and on the absence of inconsistency between the international position and the fundamental rights chapter to recognise the rights of transgender persons. Justice K.S. Puttaswamy (Retd.) v. Union of India (2017) 10 SCC 1 went further: the right to privacy was traced through Article 12 of the UDHR and Article 17 of the ICCPR, and the Court held that in the absence of a specific prohibition, international principles aligned with the Constitution must be read into the fundamental rights chapter. India is a signatory to the UDHR and has ratified the ICCPR, both of which the Court treated as having persuasive value over Indian legislation. The constitutional warrant for that move is Article 51(c).

The interpretive use is not a back-door incorporation of unenforced treaties. The Supreme Court has been careful to confine the technique to two conditions: there must be no inconsistency between the international principle and the domestic constitutional text, and there must be no clear contrary parliamentary enactment. Within those conditions, the Court has used Article 51 as a bridge between the international human-rights regime and the fundamental-rights chapter — a bridge that is examined more fully in the next chapter alongside the Vishaka line of authority.

What the architecture does not do

It is as important to know what the constitutional architecture does not achieve. Three negatives are worth fixing in mind.

First, Article 51 does not make international law part of the municipal law. It is non-justiciable under Article 37, and a litigant cannot bring a writ in the Supreme Court to compel India to honour an international obligation. The duty Article 51 creates runs to the State qua sovereign; the corresponding right of action lies, if anywhere, in the international plane.

Second, Article 73 does not allow the executive to alter or amend Indian law by treaty. The rule survives that a treaty altering domestic statutes, creating new offences, or imposing new burdens on citizens cannot become a source of municipal rights and duties without parliamentary legislation. Jolly George Verghese is the cleanest application — a covenant on civil rights, even ratified, cannot displace Section 51 CPC until Parliament amends the Code.

Third, Article 253 does not, by its own force, transmute treaty text into Indian law. It is a power, not a self-executing clause. Until Parliament enacts a statute that gives effect to a treaty, the treaty's provisions remain undertakings on the international plane and may at most operate as interpretive aids in domestic litigation. The ICJ judgment in Kulbhushan Jadhav (India v. Pakistan) (Judgment of 17 July 2019) provides a contemporary illustration of how this distinction works for India before international tribunals — the Vienna Convention on Consular Relations bound Pakistan as a matter of treaty obligation regardless of how its domestic law treated consular access. The diplomatic-immunity chapter on diplomatic and consular privileges and immunities and the chapter on landmark ICJ decisions including Kulbhushan Jadhav both pick up the consular-access strand from a different angle.

Where the chapter sits in the larger scheme

The constitutional architecture for international law in India is the foundation on which every subsequent chapter in this subject builds. The chapters on State recognition and succession, State jurisdiction, refugees and asylum in India, and public versus private international law all assume that the reader has internalised the dualist starting point and the three constitutional nodes — Article 51, Article 73, Article 253 read with Entry 14. Once the architecture is fixed, the case law is no longer a sprawl of ad-hoc judicial choices; it is a controlled doctrine of constitutional implementation.

The reader who wants the broader doctrinal map of how Indian and international legal orders relate to one another should also consult the subject hub at International Law for the Judiciary, which collects the full chapter set and tracks the relationship between this constitutional architecture and the substantive areas — human-rights, environmental, humanitarian, criminal — that depend on it.